The primordial spectrum in WI is given by [1]}, [2]}:
\(P_{{\cal R}_*} = \left( \frac{H_*^2}{2 \pi \dot{\phi }_*} \right)^2 \left( 1 + 2 n_* + \frac{T_*}{H_*}\cdot \frac{2 \sqrt{3} \pi Q_*}{\sqrt{3 + 4 \pi Q_*}}\right) G[Q_*] \,, \) 
